package com.xk.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
@Service
@Component
public class MyLb implements LoadBalancer{
    private AtomicInteger atomicInteger = new AtomicInteger(0);
    public final int getAndIncerment(){
        int current;
        int next;
        do{
            current = this.atomicInteger.get();
            next = current >= 2147483647? 0 :current+1;
        }while(!this.atomicInteger.compareAndSet(current,next));
        System.out.println("第几次访问next:"+next);
        return next;
    }
    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances) {
        int nextIndex = getAndIncerment() % serviceInstances.size();

        return serviceInstances.get(nextIndex);
    }
}
